Clutch control mechanism



Oct. 154, 1940. c. R. PATON CLUTCH coNTRo1`J"MEcHANIsM Filed JunA, y19544 sheets-sneet- 1 S @N ww, www m N2 Oct. 15, 1940; C. R. lwww CLUTCHCONTROL MECHANISM vFiled June 4', 1934 n Sheets-sheerz 1 @Hoz wm CCL l5,C. R pATON y CLUTCH CONTROL MECHANISM Y Filed June 4, 1954 4Sheets-Sheet 3 y Oct. 15, 1940 c. R. PATON CLUTCH CONTROL MECHANISM 4Sheets-Sheet 4 Filed June 4, 19254 Nwm hm.. Nw QNJ uw uw www mm. MW

gwuc/wog ELYDE E'. FHTUN- Patented Oct. 15, 1940 Packard Motor CarCompany, Detroit, Mich., a corporation of Michigan d "Application June4,19s4,s,eria1ivo.72s,92o

1o claimsl (o1. 19a-91)A v This invention relates to., motorvehicles andmore particularly to control-mechanism.

An object of the invention is to `reduce the manual effort now requiredin thev operation of 5. certain control mechanisms for motor vehicles.

Another object of the invention is to provide a simplified form ofmechanism for furnishing power to operate a plurality of motor vehiclecontrol devices.

10 A further object of the invention is to provide vacuum means foroperating motor vehicle control devices which will be operative as longas the vehicle is moving irrespective of, engine operation. n p 1 Stillanother object of the invention is to'provide power means for `operatingthe yclutch and brakes of a motorr vehicle which is compact and arrangedsubstantially within the horizontal plane I of the vehicle frame inorder `that theground y" clearance of a chassis may be as desired.-Other objects of the invention will appear from the followingdescription taken iniconnection with the drawings, which form a partofthis specifica-f tion, and in which:

m Fig. l is a side elevational view o'f a,'portionv of a motor vehiclechassis, partly broken away and partly in section, having myinventionfassociated i therewith;

Fig. 2 is a plan view of aportionfofthefsamefl Fig. 3 is a diagrammaticview of a vportionJpf'jf a motor vehicle showing anauxiliaryvacuumcreating means; f l Fig. 4 is a side elevational view,patlyin sec-'f 33 the clutch operating mechanism;

tion and partly broken away,showing a. part of l tween the side sillsusually employed to givefrigid; 35

Fig. 5 is a sectional view, taken on line 5-` 5 of Fig. 4, illustratinga power control valve device;

Fig. 6 isa sectional view, taken on line 6-f-6 of Fig.,10, showingbearing means for the cross 4 brake mechanism shaft;1 Y Fig. 7 is'asectionalview through the power cylinder for actuating the brakemechanism;

Fig. 8 is a sectional View taken on line 8-8 lof Fig. 4; 45 Fig. 9 isanother sectional view taken on line 9--9'o`f Fig. 4;

Fig. 10 is a sectional view taken on line III-I0 of Fig. 2;

Fig. l11 is a sectional view taken linen-I-If-II `a -lay shaft 36,. suchshafts carrying the usual secured to therearfend' of the'engine is atransmission casing Ithaving a drive shaft I5 theref in. The forward4end of the drivel shaft is mounted ina bearinggI fseatedr` in a recessin therear end ofthe crankshaft and a clutch throw-outV col- 5 lar I7 isslidablymounted on the forward end of the drive shaft. c

Between the clutch throw-out-collar vand the` ywheel is a conventionalclutch. Friction discs I9 are Sndabiy keyedcn the'fdriveshaft l5" and 1Qare engagedA ini driving relation'wi'tvh the flywheel by axially movablepressure plates I8.: Apluraliv ty ofbolts, as indicated at 20,arefanchoredtothel Viiyvvheel `and pass through the axially movablepressure plates I8 and the rear clutchcover plate 15 2I, 'suitablefcoilsprings 22 being interposedbetween the rearv plate I8 and the coverplate to lno rmally maintain the movable clutch discs-,I9 indrivingrelation with the. flywheel. A plurality ofy fingers,.asindicated ati 23, extend, radially 20 'throughthe rear coverplateand` pivot intermedi ate theirends againstthe plate. 'ThefinnerVends of the fingers are in engagement with thel throvv-4 n out collarLIIandy theouter ends 'of thengers arepiloted'on bolts lZltiixecl totherearvclutch 25 plate I 8, springs `25. being` interposed Abetween thengers andthe clutchfplate ina"'re1ation"sur rounding the, bolts. n

, The enginefijsrsmtabiy :rimmed upon..a. fram7 Ahaving-longitufdinall'yextending channel side 'sills 30 '26, and intermediate bracemeansconsisting `of angular members 21;.'secured together atytheir .apexby plate means 28. `Itf'wi'll be understood i thatthe frame kalso hasother brace means be`4 ityr throughout v,the length of. the structure.'.The

dashisifndicated at 29,.the'toeboa'rd at lStand the oorboardat 3l,suchjy construction being con7` ventional-body design. Y.

The frame is supported. on. wheels, ,as indicated 40 at 32,`and apropeller shaft vv33` extends fror'njzthe transmission casing tothedrive axle, yas irililic'a'tedk at 34, connected with the rearvl/heels., Within. n the -transmission casing is a driven shaft 35 andtransmissionygears,for transmitting power from thedrive-shaft I5 to thepropeller shaft 33. A

' further ,description` ofthis transmissionrnecha nism is not believedto be necessary asit is con-k` ventional'with motor'l vehicles as shownandade- '5 scribed in. Patent 13:9` ,319, Aissued AN Iay 6', '1824 to'Joseph Brodie." g A L l l Associatedfw h the front wheels v`are brakes,one of whichis indicated vat 31, and'associaijed with the rear wheelsare brakes,y one ofwhichiis 6l indicated at 38. Intermediate the frontand rear brakes, an operating shaft 39 extends transversely of the frameand is provided at each end with a hub 40 having oppositely extendingarms 4| and 42 formed therewith. The arms 42 are connected by rods 43with rear brake control means 44 while the arms 4l are connected by rods45 with control means 46 for the front brakes. cross shaft 39 willoscillate the arms 4l and 42 and move the rods 43 and 45 tosimultaneouslyv apply and release the brakes.

The cross shaft is rotatably mounted in apair of bearings 41 which arefixed one to each side sill by bolts 48. The shaft extends throughopenings in the brace members 21 and through an opening in a bracemember 49 fixed to one of the side sills by bolts 50. Fixed to one ofthe brace members 21 is a bracket 5I carrying rollers 52 arranged tobear against the cross shaft and serving as a bearing for the centralportion thereof. If the shaft should break at either end, the portion towhich the operating mechanism is still connected will continue tofunction because such portion of the shaft will be supported by itsbearing 41 and by the brace members 21, 49 and 52 depending upon wherethe shaft is broken and, under such circumstance, the brakes at thefront and rear at one side of the vehicle will be operative.

An arm 53 projects upwardly and inwardly from each of the bearingmembers 41 and vibra.- tion absorbing coil springs 54 and 54 extendbetween the arms and the shaft 39.` AAnchor memy bers 53 xed to the armsproject into the top of the spring coils while anchor members 55 arefixed to the shaft 39 and project into the bottom of the spring coils. Acollar 56' surrounds the brake shaft and has an opening therein throughwhich the anchor member 55 for the spring 54 projects. Coil spring 52'surrounds the brake shaft and bears against the bracket 41 and theWithin this conduit means is interposed a valvehousing 51 having a seatadapted to be closed by a one-way valve 59 normally held closed bythecoil spring 59. This valve is held open while the engine is running dueto the low pressure condition in the manifold Il. In Fig. 3, I haveillustrated an auxiliary vacuum creating means which includes a pumphousing 60 and a diaphragm pump 6I normally extended by a coil spring 62within the housing. There is an air outlet chamber 63 within the housinghaving a port 64 normally closed by a one-way spring pressed valve 65.'I'here is an air inlet chamber 66 having a port 61 normally closed by aone-way spring pressed valve 68. Connected with the inlet port 61 is a.conduit 69 leading to the tank 55. Connected to the diaphragm is a rod10 with which a driving cam 1I engages, such cam being fixedto an end 12of the lay shaft 36 extending beyond the rear end of the transmissioncasing. When the engine is operating, suction in the intake manifoldcreates a partial vacuum in the tank Rotation of the 55. As long as theengine is operating with the main clutch engaged or while the vehicle ismoving with the transmission mechanism in driving relation, the layshaft extension 12 and cam will be rotated, and the cam together withthe spring 62 will cause the diaphragm 6I to reciprocate and therebycreate suction in the system. The valves 58 and 63 serve to close thetank from the vacuum creating means when they fail to producesub-atmospheric pressure in the power system and consequently a lowpressure condition will remain in the tank sufficient for effectingseveral power operations of the clutch releasing mechanism and the brakemechanism after the engine stops or when the vehicle progress ceases. Itwill thus be seen' that a partial vacuum isl produced in the system` byconnection with the manifold when the engine is running and that thereis a positive auxiliary partial vacuum creating means associated withthe system which is operative as long as the vehicle is moving with thetransmission mechanism in driving relation. Under such conditions, thepower means will be effective wheneverthe vehicle is moving with thetransmission in driving relation or the engine is operating to apply thebrakes and release the clutch through means of mechanism which will behereinafter described. A power conduit 13 leads from the tank 55 to themechanisms for disengaging the clutch and for operating the brakes.

The brake applying structure consists of a power cylinder 14 in which apiston 15 is mounted and normally held in brake release position by acoil spring 16. A conduit 11 connects one end of the cylinder with acontrol valve mechanism, indicated generally at 1B, and a conduit 11leads from the line 13 to the valve mechanism, such valve mechanismbeing regulated by mechanism under control of the brake pedal 19. Thecylinder is provided with an extension 80 which is pivotally connectedto a lever 8| pivotally mounted on a stub shaft 92 secured to one of theside sills 26 and the adjacent brace member 21, as best shown in Fig.11. Arm 93 is formed integral with the lever 8l but extends at one sidethereof where a forwardly extending rod 84 is pivoted to the free endthereof. The forward end of the rod is pivotally connected to an arm 85which is keyed on the brake cross shaft 39. Another arm 86 is keyed onthe brake cross shaft 39 and pivoted to the free end thereof is a rod 91which is attached to the piston within the cylinder 14. Loosely mountedon the cross shaft 39 between the arms 85 and `86 is an angular lever 88to one end of which is pivoted a forwardly extending rod 89, such rodbeing pivoted at its other end to lever 90 rotatably mounted upon stubshaft 9| carried by one of the side sills and a bracket 92 xed to thebrace member 21. Formed integral with the arm 90 is another arm 93pivoted at its forward end to ra link 94 which extends through thetoeboard and is pivoted to the treadle 19. A coil spring V96 isconnected at one end to the pivot connecting the rod 89 with the arm 99and is secured at its other end to the adjacent brace 21,such springbeing of a character to normally exert a force which is suiiicient tohold the treadle 19 in its uppermost position. Arm 96 is formed integralwith the arm 85 and extends in an opposite direction relative thereto,such arm having a link 91 associated with the valve control mechanismand a similar link 96 is pivoted to the arm 98 and is associated withthe valve control mechanism. A coil spring 99 is secured at one end tothe pivot connecting the rod 81 with the arm 86 and at the other? end tothe pivotally carried by a .pin

adjacent frame sill 26, such spring being designed to exert a forcewhich will return the brake mechanism to` a position releasing thebrakes when the manual or power operating means are ineiective.

The conduit 13 is also connected withA another valve control device,designated generally at |00, which communicates with apower cylinder |0|through means oi a conduit |02. This power cylinder is provided withv anextension |03 which is |04 on the bracket 49. The Valve control deviceconsists of an end casting |05 to which is fixed a pin |06 and'securedto this casting is a diaphragm valve |01, an inner cover plate |08 and.anV outer cover plate |09. Reinforcing plate members ||0and |I|arearranged on opposite sides of thediaphragm. The

` diaphragm and the plate members are secured to a hub' I2 which '1sslidable axially on the stem I3 extending from the casting and securedto the hub vis a pin ||4 having anend bifurcated exteriorly of the outercover.

Between the inner and outer covers is arranged steel wool I5, or somesimilar material, and extending between theinner coverA and thediaphragm is. acoil spring ||6. .A duct I |1.v is formed in the endcasting and .isconnected with .the conduit 13 lby av connectionvIlB. Theconduit |02 connectsther rear end of the power cylinder ||l| withthespace between the end cast# ing andthe diaphragm so that whenfthedia' phragm covers the outlet end of the duct, flow is cut off betweenthe conduits |02 and 13 and the piston within the cylinder |0| isineffective. When the valve is closed, the power line |02 is open toatmosphere through openings in the diaphragm, the reinforcing `platesand the cover members.

understood that the valve control device 18 associated with the brake4applying power mechanism.v is similar in detail to the valve device forcon-- trolling the clutch power means. y 1.

On the stub shaft 9| is freely mounted :a hub member |20 having an arm|2| extending therefrom to which 'a rodV |22 ispivotally mounted. Thisrod is also pivoted to a vclutch throw-out leverl23 having a-yoke at itsupper end whichl straddles the shaft I5 and engages'the throw-outcollar|1. At each end of the hub I arrange plate members mounted on the lstubshaft 9| andare secured together by a bolt |26 to forma carrier struc;ture. Pivotally mountedon this boltwis an arm |21 having a curvedportion |28', complementary to the hub member, carrying a pawl |29 withserrationssimilar'and adapted to engage' with ser-y lrations |30 formedonaportion of the peripheral surface of the hub l'| 20. "An arm |3|extendsfrom the lever |21 and is pivoted to the pin I06ofthe valvedevice and a rod |36 lextending to the piston in the cylinder |0| ispivoted to the end of the lever. An .arm |32 is pivoted 'at one end tothe pin I I4 of the valve device andis carried by a hub |33 from whichalso extends'a lever |34. Link |35 is pivoted to the free end of thelever |34 and extends through an opening in the toeboard where it ispivoted to a voct tread1e.|36. A coil spring |31 is iixed at one end toa pin-|38 mounted on an ear |39 on the hub |20 andfisxed at the; otherend to apin |40 xed to Van extension |42 onthe plate member |24. Roller|4| on the pin is It will be understood that the con-'f struction of thepiston and the mechanism within the cylinder IOI is similar to that ofthe brake i power mechanism as shown in Fig. 7 except that the cylindervis anchored, and it is `also to be.

|24 and |25 which arerotatablyf located so that it will engage thetopflange of the adjacentframe side sill and limit rotational ymovement ofK the arm |21 carried thereby. Asrvthe Vspring is fixed to is alwaysexerted to take up slackf'iin the mech" anism Y between the arm |2| -onthe hub. The movement Arequired the members |24, |25 and the fulcrum 'ofY the clutch throwfoutjcollar and by the pedal to drivingly rengage theserrations `on y the pawl and on the hub can be.A regulated byadjustment ofthe pin l0l |05 in the'valve ,device casting,asthe'clearancebetween the serrations isy thusregulated.l Thejpositionofthe hub is fixed in one direction by the ro1lerandthespring |31.sothat pivotal adjustment; of the'l lever |21 by axial adjustmentserration clearance.

of thev pin |06 will regulate To disengage 4the clutchV the:treadle`l36` is pressed kdown and suchmotion'is transferred to the.lever |34 by the link |35. As the arm |32 is integral with. the lever|34, it will7 bef rocked :upwardly moving the valve device |00 and thelever arm I 3| therewith u ntil the serrations on the pawl |294 engagetheserrations |30v on vthe hubi`l20,

the lever |21 swinging on itspivot |26. When vthe serrationsbecomeengaged in thisfmanne'r, v'the' Y rotation ofthe hub |20 is opposed bythe clutchy springs 22 because of the connection |22, .the lever |23 andthe throw-out collar |1 so that further pressure againstrthe treadlewillmove the pin |I4 and hub ||2.axially of the stem AI I3 and lift.

the diaphragm |01r to open the ductV I I1 so that.-

the conduits 13 and |02 are in communication whereupon'vacuum in thesystem, developedinA the manifold or by the pump, will move the 4pis-`ton in the cylinder I0| to the right. lBy. means of. the rod |36, suchmovement is transmitted to the lever I 21 to automatically.continneimovement by power in' the same direction as rst' instituted bytreadle pressure so`,that ,thelhub |20-, will be rotated and operate thethrowfoutmech-r..

anism to disengage the clutch. y I l Upon release of foot pressure, thediaphragm will return to close the vdu.ct.| |1 vthusy cuttingoffthevacuum and makinglthe power means ineffective. Theclutch springs willthenrotate thehubV |20 in a clockwise direction, as viewedin'Fig. 4."

'and will move the lever therewith untilthe pawl serrations becomerations. The spring |31 tl'ienA comesdnto effect ,to swing the roller|4| against the foot board' thus rotating the'members |24 and |25 andthe'ful"` crum of the lever extent than required when" the powerdevicebecomes eifective and thus move the lever|21 While engagingthe'hub to disengage the clutch aspreviously described. The treadleposition will remain constant as any'slackin the-mechanism will becompensated for due to the relation of the engaging-.means between thehub I20and the' lever. |21. With this clutch operatingrstructure,

the movement of the throw-V-out-collar I1 will be proportional tothe`.treadle'movement because the Valve device is` theconnecting linkbetween the disengaged froml ythe Y hub SerfY |21 to position 'of rest.rIt will be'funderstood that the treadle canlcefpushed4 down by foot toraise the valvdvi to a' greater" 55:

treadie 'ariri'v-fl'az Vandthe arm |121 fjwhicnf'is responsive to powerandfoot pressure. Y

Itjwill be seen that the valve is Vpenedto the/power deviceeifectivewithout. requiring much foot pressure or pedalmovernent and .thus littlephysical effort is required when thepower Vmeans is utilized todisengage the clutch. Thereyis enough pressure required bythe driver sothat he `will be sensitive to valve closing reaction. rllhe clutchoperating mechanism, due to its design and mounting, is containedsubstantially in the horizontal plane of the frame and thus'will notaffect ground clearance in the vehicle design.

To apply the brakes, the treadle 'I9 is pressed downcausi'ng the link 94to travel therewith and rock the lever 93 downwardly and the arm 9Uforwardly. Suchv movement of the arm will ymove the rod 89 therewithwhich in turn will rock the lever 88 upwardly. Movement of the valvedevice 18 with the lever 88 is opposed by the springv forces holding thebrake actuating mechanism in brake releasing position and thereforemanual effort is only required to lift the diaphragm valve |01 in thebrake valve device to establish open communication between the conduit11 and the conduit 11. When such communication is established, vacuumwill move the cylinder for- Wardly and the piston rearwardly, thusexerting two forces to turn the brake cross shaft. cause of sucharrangement, a smaller cylinder can be utilized and the shaft operatingmechanism can be arranged substantially in the horizontal plane of theframe.` The piston movement carries the rod 8l therewith and rocks theshaft as the rod is pivotedto the arm 86 keyed on the shaft. Forwardmovement of the cylinder will rock the arms 8| and 83 forwardly and turnthe brake shaft through means of the rod 84 and the arm 85 keyed to theshaft.

Release of pressure on the treadle releases the diaphragm in the valvedevice shutting oli vacuum from the cylinder whereupon the spring 99will return the brake shaft to normal brake release position. Spring 95will then return and hold the treadle in its uppermost position, thisbeing required as the lever 88 is loosely mounted on the brake shaft. Itwill be seen that, when the power means is ineffective, the brakes canbe applied manually by manually applied force on the treadle |36 whichis transmitted through lever |34,` rod 89. lever 88, the valve device'i8 and arm 96 to rotate the brake shaft.

The brake applying mechanism is relatively compact and can be locatedwithin the horizontal plane of the frame due mainly to the compoundvacuum applied forces allowing the use of a small power cylinder.` Thebrakes and the clutch are operated from a `single power system which iscontrolled manually to selectively operate the desired mechanism. Thesystem issuch that vacuum will fail only when the engine has stopped andthe vehicle is not moving or where the 'transmission mechanism is out ofdriving relation with Athe engine stopped. v

Although the invention has been described in connection with a specificembodiment, the principles involved are susceptible of numerous otherapplications'which will readily occur to persons skilled in the art. Theinvention is therefore to be limited only as indicated bythe scope ofthe appended claims.

What I claim is:

1. Clutch` operating mechanisml comprising a physically'operable lever',arotatably mounted member connected to control theclutch, an actuatorlever,` and a valve device connecting the physically operable levermeans with the actuator` lever, said actuator lever being engageablelWith said rotatably mounted member to rotate the same afteralpredetermined movement of the physically operable lever.

2. Clutch operating `mechanism comprising a shaft. a pedal operatedlever mounted on the Be- Y shaft, a member rotatably mounted on theshaft and connected to control the clutch, an actuator lever adapted tobe moved to engage and rock said rotatable member, and a valve deviceconnecting the pedal operated lever in motion transfer relation with theactuator' lever, said valve device being adjustable to regulate theclearance between the actuator lever and the member.

3. Clutch operating mechanism comprising a shaft, a physically operablelever pivoted on the shaft, a hub member rotatably mounted on the shaft,pivot carrying means rotatably mounted on the shaft, an extension on thepivot carrying means, an actuator lever mounted on the pivot Carryingmeans and engageable to rock the hub member, a valve device connectingthe physically operable lever with the actuator lever to transmitmotion, clutch throw-out mechanism connected to be actuated by the hubmember when rocked, and means connecting said hub `member and saidextension in a relationto take up slack in the clutch throw-outmechanism and to normally maintain the actuator lever in extremeineffective position.'V

4. Clutch operating mechanism comprising a physically operable levermeans, a rotatably mounted hub membenconnected to throw out the clutch,actuator lever means movable to engage and rock the hub member, a valvedevice connecting the actuator lever means and the physically operablelever means, and power means controlled by said valve device andconnected to the actuator lever means, said actuator lever means beingactuated physically through said valve device and said physicallyoperable lever means or actuated by the power means to rock said hubmember.

5. Clutch releasing mechanism comprising a frame, a shaft xed to theframe, a serrated driven hub Vmember 1 loosely mounted on said shaft, apair of plate members loosely mounted on said shaft one at each end ofthe hub member, a pin fixing the plate members together, an actuatorlever pivotally mounted on the pin and having a serrated portion adaptedto drivingly engagethe serrated portion of the hub member,

means for disengaging the clutch connected with said hub member, amanually rockable lever mountedV on theshaft, a valve device connectingthe rockable lever and the actuator lever, an extension on one of saidplate members carrying a roller, said roller being located to engage theframe and limit rotation of the plate members in one direction, andaspring connected between one of the plate members and the hub memberurging the rollerin the direction ofthe frame.

6. Clutch operating mechanism comprising a shaft. aserratedhub.rotatablymounted on the shaft, an arm fixed to the hub,`means operated by the arm for disengaglng the clutch, a second arm fixedto the hub, an angular lever rotatably mounted on the shaft, manuallyoperable means connected to one end of the angular lever, a power valvedevice connected to the other end nf the angular lever, a pair of platemembers arranged one at each end of the hub and rotatably mounted on theshaft, a pivot member carried by the plate members, a lever mounted onthe pivot andconnected to the valve device, a pawl carried by the lever`engageable with hub serrations, an extension on one of the platemembers having a pin thereima roller on the pin adapted to engage anabutment thereabove, a coil spring connecting the pin and the second armon the hub,lvacuum operated power means controlled by the valve device,rand a connection between the power device andthe pawl carrying lever.

7. AClutch releasing mechanism comprising a frame, a shaft xed to theframe, a serrated driven hub member loosely mounted on said shaft, apair of plate members loosely mounted on said shaft one at each end ofthe hub niember, a pin fixing. the plate members together, a drivinglever pivotally mounted on the pin and having a serrated portion adaptedto drivingly engage the serrated portion of the hub member,

means for disengaginif,r the clutch connected with said hub member, amanually rockable lever mounted on the shaft, and a valve device con'necting the rockable leverand the driving lever, said valve device beingadjustable to regulate the clearance between the serrations on thedriver lever and the serrations on the hub member.'`

8. Shiftingv mechanism comprising Ya shaft, a

Ypairo'f members rotatably mounted on said shaft,

a lever pivoted on .one of said members and swingable to drivinglyengage and rock the other member, shifter means connected to o'eactuated by said rocked member, a', physically operable lever, a powervalve device connecting said physically operable lever and saidrstmentioned lever, power `means connected with said first ymentionedlever, said power means being 'con' trolled byy said valve device asinuenced by said physically operable lever, and `means vnormallydisengaging said first mentioned lever from driving engagement with saidrotatably mounted member. v

9. Shifting mechanism comprising a shaft, a pair of members rotatablymounted'onfsaid shait, a lever pivoted on one of ysaid membersandswingable to drivingly engage and rock the other member, shifter meansconnected to be v'actuated by said rocked member,.a" physically operablelever, means connecting'said physically operable lever and said firstmentioned lever, and springA ymeans associated with said rotatablymounted` members for positioning them to` normally` mainr tainsaidshifter means in one extreme position and to'disengage said firstmentioned'lcver from the rotatablemember which it rocks,`v f n I l0.Shifting mechanism comprising a shaft;

-pair of members rotatably mountedzon said shaft,

a lever pivoted on one of said members and swing-V "1 able to drivinglyengage and rock theother mem-fL f a power valve device connected withsaid physicallyoperable lever, adjustable meansk connecting saidpivotedlever with said power v`valvedevice, the adjustment 'ofv saidconnectingV means varying themovement required for said pivoted level*to drivingly engage the member it-is adapted to'- f ber, shaft meansconnected to be actuatedfby said rocked member, a physicallyoperablelever, '20

rock, power means connected with said rstnien-k tioned lever, said powermeans being controllable -by said valve: device as influenced-by saidphysically operable lever, and means normallyedisen-,

`gaging said first mentioned lever from driving engagement with saidrotatably mounted rnem-k CLYDE RQPATQNQ,

